/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMModel/Nodes/RigVMLibraryNode.h
The Library Node represents a function invocation of a function specified somewhere else. The function can be expressed as a sub-graph (RigVMGroupNode) or as a referenced function (RigVMFunctionNode).
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(BlueprintType) class URigVMLibraryNode : public [URigVMTemplateNode](API\Plugins\RigVMDeveloper\RigVMModel\Nodes\URigVMTemplateNode)